Brush mounting



March 30, 1943. v o, ZADNIK 2,315,177

BRUSH MOUNTING Filed Aug. 6, 1941 In vemor I 0550 waZn/X' I BY 04M Afforn eys Patented Mar. 30, 1943 p UNITED; PATENT OFFICE BRUSH MOUNTING t. zadmk, Stuttgart, Germany; vested in ApplicationAugust 6, 1941, Serial No. 405,671

. InGermany March 14, 1940 7 Claims.

This invention relates to an improved brush mounting, particularly for ventilated enclosed commutator machines.

An object of this invention is to provide an improved arrangement for cooling brushes, particularly in a ventilated enclosed commutator machine.

Another object of this invention is to provide an improved arrangement for cooling the commutator of a ventilated enclosed commutator machine.

A further object of this invention is the provision of an improved brush holder having a plurality of cooling ribs.

A still further object of this invention is the provision of an improved brush holder having a plurality of vanes for directing cooling air against a commutator.

An additional object of this invention is to provide an arrangement for positively guiding a cooling air stream about the commutator of a ventilated enclosed commutator machine.

These and other features of the invention will be best understood and appreciated from the following description of a preferred embodiment thereof, described for purposes of illustration and shown in the accompanying drawing, in which:

Fig. 1 is a side view in half cross-section of a single phase railway motor embodying the improved construction of the present invention;

Fig. 2 is a partial cross-section upon an enlarged scale along the line IIII of Fig. 1; and

Fig. 3 is a top View in the direction of the arrow S of Fig. 2, with the brush arm and the pressure spring removed.

The invention is illustrated, by way of example, in Fig. 1 in connection with an enclosed railway motor having an armature l to which is coupled a blower propeller wheel 2 adapted to suck in cooling air in the vicinity of the commutator 3, and pull it through the length of the motor and expel into the open. A part of the cooling air in this case passes through the inside of the commutator 3 and also cools the interior of the armature I, in a manner known per se, while most of the cooling air flows about the brushes 4', combined as a brush group 4. In accordance with the principles of this invention the bearing cover 5 on the commutator side of the motor is provided with an opening 6 for each brush group, the brushes being positioned substantially in the direction of the axis B-B.

As is shown in all of the figures, the brushes 4' are guided in brush boxes I supported by spaced ribs 8 bridging the opening 6, and the outer ends of the ribs 8 are connected together by means of a side strip 9 forming an integral brush holder II for each brush group 4. 'The brush holder H is then mounted on the bearing cover in any suitable manner, such as by means of studs l0, and suitable insulation is interposed between the brush holder and the bearing cover.

By reason of the aforedescribed construction, the opening l2 between the spaced ribs serves as the air inlet, while the ribs themselves, in addition to supporting the brush boxes I, also both serve to form heat-conducting cooling surfaces in contact with the entering cooling air, and also as guiding vanes for guiding the air to the commutator 3. In this connection, attention is directed to the fact that that portion of the bearing cover l3, containing the inlet opening and the brush mounting, is formed as a baffle section spaced from but surrounding the periphery of the commutator 3. The baflie section accordingly acts to positively guide the air about and in contact with the commutator, so that a sure and efiicient cooling of the latter is brought about.

For the sake of safety, an additional protecting cover I4 is added above the brushes, as can be seen in Fig. 1.

It is of no particular importance with respect to the principles of the construction proposed in the present invention, how many groups of brushes are provided, what the type of commutator machine may be, or in which direction the cooling air flows relatively to the brushes. The cooling air can be supplied by an integral fan, as illustrated, or by auxiliary means.

It will be seen therefore that I have provided a device which fulfills the objects primarily stated, and while I have shown a single embodiment of my invention, it is clear that other forms thereof may be readily provided without departing from my invention as defined in the following claims:

1. A ventilated enclosed commutator machine with openings for the passage of cooling air, a commutator, and brush holders connected across said openings, said brush holders including brush boxes supported in said. openings by spaced ribs serving as cooling surfaces, between which cooling air may flow, and brushes in said boxes contacting said commutator.

2. The combination according to claim 1, in which said ribs are formed as air-guiding vanes for directing the cooling air toward said commutator.

3. The combination according to claim 1, in which said machine is provided with an end cover having a section spaced from and surrounding said commutator, said cooling air openings being formed in and spaced about said section of said end cover, whereby said section acts as a baflie to distribute cooling air about the entire periphery of said commutator.

4. The combination according to claim 1, in which each brush holder is formed as an integral unit, said brush boxes being formed integrally with said ribs, and said ribs being integrally intel-connected with one another at their outer ends by suitable connecting strips.

5. The combination according to claim 1', in which said machine is provided with an end cover having a section spaced from and surrounding said commutator, said cooling air openingsbeing formed in and spaced about said sectionofi said end cover, whereby said section acts as a baflle to distribute cooling air about the entire periphery of said commutator, and in which each brush holder is formed as an integral unit, said brush boxes being formed integrally with said ribs and said ribs being integrally interconnected with one another at their outer ends by suitable connecting strips, and means for insulatingly supporting the connecting strips of each brush holder to the commutator-surrounding section of said end cover to hold said brush holders in said opening.

6. The combination according to claim 1, in which the longitudinafaxes of the brushes extend substantially in the direction of the air passing through the openings in which they are positinned.

'7. an integral brush holder comprising a plurality of aligned brush boxes, spaced ribs extending outwardly from opposite sides of said boxes, andconnectorsinterconnecting the outer ends of the ribs .toform a unitary brush holder structure.

O'I'IO ZADNIK. 

